let a = [1,2,3,[5,6,7,8,[9,10,11,[12,13,14,[15,16]]]]]
let b = a.join().split(',') 
let d = (a + '').split(',') 
let c = a.toString().split(',')
console.log(b)
console.log(c)
d = d.map(parseFloat)
console.log(d)
